class Lady {
    content = "Hi"
    say() {
        return this.content;
    }
}
const god = new Lady()
console.log(god.say());

class Xjj extends Lady {
    say () {
        return super.say() + '3'
    }
    sayHa () {
        return 'Ha ha'
    }
}

const jj = new Xjj()
console.log(jj.say());
console.log(jj.sayHa());
